Gender Bug ga Hassei Shimashita!

Gender Bug ga Hassei Shimashita! summary:

Sakuma Haru is a high school freshman boy who loves games. He is a coward who often tries to please those around him and has a hard time saying no, always relying on Minatsuki Karen, who goes to the same school. One day, a loud thunderclap rings through the school, and before he knows it, Sakuma has turned into a girl! When he wakes up, he finds himself in the world of his favorite game, \"Mirage Universe,\" and due to a game bug, Sakuma and Minatsuki have switched genders!?